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History

David Stack was a patient in the 'Mad Dog Ward' of a mental asylum who believed he was a superhero called Captain Zero. When Peter Parker was knocked out outside the gates of the asylum, he was mistakenly thought to be one of the patients, stripped of his costume, and committed. Stack befriended Parker while he was in the Mad Dog Ward.[1]

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Telepathic Resistance: Experiments by Doctor Hope made Stack's resistant if not immune to telepathy.[2]

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